[lowfighter]

So for installing is like this:
Open the rar file
Take from it the "maps" folder and drop it into "il2root/mods/mapmods"
Create a folder let's say "il2root/mods/mixx_3D"
Take the "3d" folder form the rar archive and drop it into "il2root/mods/mixx_3D"
Do the normal add to all.ini of the map name and path
See if it runs ok in game.
Now if you want to disable the new skins of the old objects: just rename the folder
"il2root/mods/mixx_3D/3d" to something which distorts the word "3d" for example
rename to "il2root/mods/mixx_3D/X3d" . In this way you can switch between seeing the repaints or seeing the old skins.
You can even play the Zapolare map with "il2root/mods/mixx_3D/X3d", it will run ok, just you'll see the old buildings skins.
If you have already vpmedia's beta with new skins for the default old buildings these will likewise affect all maps too. My advice is to install it and check the look of the maps with it. I like a lot some of them, some not but it's easy then to disable not the whole mod but just the particular object you don't like. To explain for our case, say I don't like the new look of ClutterMoscow1. I browse "il2root/mods/mixx_3D/3d" till I find the folder "ClutterMoscow1". I rename it let's say to "XClutterMoscow1" and it's then disabled, you get the old look of ClutterMoscow1 house. Most of the objects new looks which are in the "il2root/mods/mixx_3D/3d" are done by vpmedia(the above mentioned beta skins pack) and lal_rone, but RONE has created the skins for independent objects, you know his hangar mod etc).
Hope it helps, maybe there's a better solution but...